Is this an authentic Chinese method?

Yes. The underlying text is from mainland Chinese workshop literature aimed at small producers and home makers; the English on this page is a direct translation with the original numbers and steps preserved.

What do I need to get started?

Common discrete components, a breadboard or PCB, a low-voltage supply and a multimeter. No specialised tool is required for the first build.

How long does it take?

The timing depends on your climate, batch size and equipment rather than on the text; the source records the process sequence rather than fixed hours, so follow the stages and check the material state at each one.

Can I run this as a small business?

Many entries in this collection were written with small-scale and home production in mind. Before selling, confirm the food-safety, labelling and local-registration rules that apply where you operate.

Is the full text available?

The complete English translation is in this article and is the same text used for the PDF download. Buying the PDF unlocks the full document without the preview cutoff.

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Traditional Chinese Frequency selection sound control switch (Workshop Practice) — Circuit, Wiring & Debug Guide

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In short: Traditional Chinese Frequency selection sound control switch (Workshop Practice) — Circuit, Wiring & Debug Guide. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 1791 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.

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Frequency selection voice control switchThis voice-activated switch can control the on or off of any electrical appliance with a specific tone (500 to 2000Hz) sound. Since it has a certain frequency selection function, the probability of malfunction is small.The circuit is designed to be controlled by audio electrical signals (up to 100mV). The control signal source can be a telephone, radio, record player, or tape recorder, and is led from an appropriate point with a shielded wire. If you want to use sonic remote control, just add an electret microphone and a first-level preamplifier. …

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